Screw and slide valve



(No Model.) 3 Sheets-Sheet 1. DE LEON DAVIS.

SCREW AND SLIDE VALVE.

No. 410,499. Patented Sept. 3, 1889.

(No Model.) 3 Sheets-Sheet 2.

DE LEON DAVIS SCREW AND SLIDE VALVE.

Patented Sept. 3,-1889.

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3 Sheets-Sheet 3.

(No Model.)

DE LEON DAVIS. SCREW AND SLIDE VALVE.

No. 410,499. Patented Sept. 3, 1889.

WIZ/VESSES M 57 49 fIZZOrneymX UNITED STATES PATENT OFFICE.

DE LEON DAVIS, OF SAN ANTONIO, TEXAS.

SCREW AND SLIDE VALVE.

SPECIFICATION forming part of Letters Patent No. 410,499, dated September 3, 1889.

Application filed April 27, 1889.

f0 whom it may concern:

Be it known that I, DE LEON DAVIS, a citizen of the United States, residing at San Antonio, county of Bexar, State of Texas, have invented certain new and useful Improvements in Combination Screw and Slide Valve, of which the following is so full, clear, and exact a description as will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawings, in which Figure 1 is a longitudinal vertical section. Fig. 2 is an end elevation, and Fig. is atop plan view.

The object of my invention is to provide a combination screw and slide valve which may be quickly operated by a lever an d firmly seated by a turn of the screw-spindle, or the valve may be closed by the screw alone or by the lever alone, the screw in such case being only used to secure atighter joint at the seat.

Another object of my invention is to provide a valve which may serve as a double stop-that is to say, one that acts as a stop for air or liquid pressure in both and opposite directions.

Another object is to provide a combination screw and slide valve with a lever for operating the valve-stem and valve, and providing this lever with a geared sector which may be locked in place by a stop, and thus serve as a nut for the spindle or valve stem.

Another object of my invention is to provide a device by the use of which the piston may be packed around the stem while working with any pressure of air or liquid through it.

In the accompanying drawings, A designates a valve-stein, to the lower end of which is secured a valve B, and to the top of which is secured a hand-wheel O, which is held in place by a nut c. The central portion of the valve-stem or spindle A is provided with a screw-threaded portion D, which meshes with a correspondingly-recessed geared sector E, which is secured to the inner end of a handlever F, and which is supported by a vertical arm G. This vertical arm G is perforated at g to receive a spring-stop 7a, which is secured to and extends through the lever F, as shown at II. The hand-lover F is pivolally secured Serial No. 308,805. (No model.)

to the vertical arm G. The valve-stemis pro vided with a stuffing-box I, which is situated just above and outside the valve-casing J. The valve-casing J is provided with a valveseat K, which is slightly beveled and adapted to receive the beveled truncated conical valve I3. The valve-casing is provided with two ways or exit-passages, one of which is lettered L and located beyond and in alignment with the valve-stem, and the other is lettered M, is situated adjacent to the opening L, and in this instance extends at right angles to the line of the opening L. It is obvious, however, that this angle may be varied at will without departing from the spirit of my invention and without in. any way interfering with its usefulness.

The upperouter portion of the vertical arm G is provided with aperforated extension G, which serves as a guide for the upper portion of the valve-stem or spindle A.

This device is designed more especially for use on ice and refrigerating machines, and it is to obviate the troublesome work of closing the valves now in use in case anything goes wrong and itbecomes necessary or desirable to immediately close the valve. It will be seen at a glace, however, that a device of this kind is admirably adapted for use in many other capacities than the one above mentioned.

The operation of my device is as follows: \Vhen the valve is in the position shown in Fig. 1 and it is desired to close it quickly, the hand-lever F is quickly elevated, thus throwing the valve-stem and valve down until the conical valve B is seated on the beveled seat K. A11 additional turn is then given to the hand-wheel O, and the geared sector E, acting as a nut for the screw-threaded portion D of the spindle A, enables the operator to firmly seat the valve, where it will remain until released either by the operation of the hand-lever F or the hand-wheel 0.

Having now described the objects, uses, and advantages of my invention and having described in detail one form of carrying the same into practice, what I desire to secure by Letters Patent, and what I therefore claim, is

1. In a valve, the main casing provided with a valve-seat and having a vertical arm rigidly secured thereto, in combination with a geared sector operated by ahand-lever and a valve-stem and valve, all constructed and combined to operate substantially as and for the purposes specified.

2. In a combination slide and screw valve,

the valve-casing and valve-seat and vertical perforated arm having a geared sector provided with a stop for holding it rigidly in place when used as a nut, in combination with a valve-stem screw-threaded between its ends and provided with a valve, substantially as and for the purposes specified. 

